Which network device segments a broadcast domain?

Which network device segments a broadcast domain?

• A. Switch
• B. Hub
• C. Bridge
• D. Router

Answer: (D)

Broadcast domains are confined by devices that route traffic between networks. Routers operate at Layer 3 and connect separate IP subnets, and by default they do not forward broadcast frames from one subnet to another. That behavior creates distinct broadcast domains for each connected network or interface, so a router is the device that segments broadcast domains. In contrast, hubs simply repeat signals to all ports, bridges and switches forward within the same Layer 2 domain (unless VLANs are used to separate them), so they do not inherently segment broadcast domains.

Broadcast domains are confined by devices that route traffic between networks. Routers operate at Layer 3 and connect separate IP subnets, and by default they do not forward broadcast frames from one subnet to another. That behavior creates distinct broadcast domains for each connected network or interface, so a router is the device that segments broadcast domains. In contrast, hubs simply repeat signals to all ports, bridges and switches forward within the same Layer 2 domain (unless VLANs are used to separate them), so they do not inherently segment broadcast domains.